legacy codecs / mixing rates and versions

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Neels Hofmeyr nhofmeyr at sysmocom.de
Tue Jul 18 09:58:58 UTC 2017


On Tue, Jul 18, 2017 at 09:48:01AM +0200, Harald Welte wrote:
> > But OsmoBSC says: "Can not have full-rate and half-rate codec." Curious, is
> > that a hard limitation? I'm not at all familiar with the reasons. Will we never
> > be able to mix FR and HR? Why then does TCH/F_TCH/H_PDCH exist?
> 
> I'm not sure why the BSC would ever say something like that.  The BSC
> normally simply picks a codec from the codecs that the MSC permits for
> the given call.  The MSC should be in charge of requesting a specific
> codec if it wants a specific one.

Been there since late in 2010:
http://git.osmocom.org/openbsc/commit/?id=7bf66c5a6ee085bb84e5f1de12725d7006cf6a3c

It sounds a bit like this belongs in the MSC instead. So far it's in the
BSC config's 'msc' item, i.e. telling the BSC the remote MSC's config.

~N
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